The air that we breathe contains oxygen, water, nitrogen, dust, pollen, pollution, and other materials. We can clean air using an air filter. Air is most likely a A compound An element A mixture A molecule

Which solution is a homogeneous mixture? O sand and water salt and water salad dressing soil

Which planet is made of mostly gas

What is mass? A. the amount of matter in a substance B. the amount of weight in a substance C. the number of atoms in a substance D. the amount of volume of a substance

Indicate how many significant figures in the following number 1.080

Perform the following calculations. Express the answers with the correct number of significant figures. a) 7 g - 3.5 g - 2.75 g = b) 200.00 kg - 199.0 kg = c) 25 L - 3.0 L = d) 0.67 cm + 2.0 cm + 0.090 cm = e) 104.5 g + 0.40 g =

A rigid cylinder with a movable piston contains a 2.0-liter sample of neon gas at STP. What is the volume of this sample when it's temperature is increased to 30 degrees Celsius while its pressure is decreased to 90 kilopascal

Write a speech aimed at year 7 to explain why some metals lose their shine over time but gold does not.

How many moles of co2 could fit in a 475 ml bag at - 22c and 1.125 atm?

How mant atoms are in 3N2

The type of nuclear decay an unstable nucleus will undergo depends on its ratio of neutrons to protons. The radioisotope cobalt-65 has a ratio of neutrons to protons of 1.41, which is too high for a nucleus of this size.